Torpedo data computer



w 5 mm mm GR 294039542 N 57 Jul 9, 1946. w. NEWELL 2,403,542

' TORPEDO DATA COMPUTER Filed Aug. 3; 1940 4 sheets-sheet 1 a? 9 1 f- POINT OFINTERCEPT- 0 1L Ci IBO-Af .s x, T 5

Q A f ATTORNEY.

Hum hm. swam W y 1945 w. H. NEWELL 2,403,542

' TORPEDO DATA COMPUTER.

Filed Aug. 3 1940 4 Sheets-Sheet 2 w 651 1 POINT or N INTERCEPT POINT OF INTECEPT vJuly 9, 1946.

' w. H. NE'WELL' TORPE'DO DATA COMPUTER Filed Aug. 3, 1940 mam HUM -4 Sh eets-Sheet 4 TARGET SP EED MULTIPLJER INVEN TOR.

William ILNewelL ATTORNEY.

ECHO 1 Lawn Patented July 9, 1946 HUG TORPEDO DATA COMPUTER William H. Newell, New York, N. Y., assignor to Ford Instrument Company, Inc., Long Island City, N. Y., a corporation of New York Application August 3, 1940, Serial No. 350,897

4 Claims. 1

This invention relates to torpedo directors and particularly to mechanisms for computing the values of the various factors involved.

The principal object of this invention is to provide a mechanism for computing the various factors involved in the directing of a torpedo to a point of intercept with the target.

Another object is to provide a torpedo director of a simpler construction and a greater accuracy than ha heretofore been known.

A still further object of the invention is to solve the problem of directing a torpedo to a target on the basis of the analysis of a fictitious torpedo fired from a reference point and traveling throughout its run at a constant speed equal to the speed of the actual torpedo and on a constant course which is the same course that the actual torpedo takes upon its settling down on a steady course to the point of intercept.

A still further object of the invention is to provide a, mechanism to solve the problem of directing a torpedo on the basis of a fictitious torpedo, as set forth in the preceding objects, but defining the reference point in coordinates parallel to and at right angles to the course of the fictitious torpedo.

Other objects will be apparent from a consideration of this specification and the drawings, forming a part of this application, in which:

Fig. 1 is a diagrammatic representation of the solution of the problem of directing a torpedo toa target in accordance with the present invention for a selected set of conditions;

Fig. 1a and Fig. 1b are modifications of Fig. 1 and illustrate the geometric aspects of the problem under certain critical short range conditions; and

Figs. 2 and 3, taken together, i a diagrammatic representation of the arrangement and cooperation of mechanisms to solve the problem disclosed in Fig. 1.

The present invention contemplates the solution of the problem of directing a torpedo to a target similar in some respects to that set forth in' an application filed on January 27, 1940, by Raymond E. Crooke, Serial No. 315,901, entitled Torpedo director, wherein the trigonometric relations of the factors involved in the problem were analyzed and solved a of the instant of the starting of a fictitious torpedo from a reference point defined in coordinates parallel to and at right angles to the course of the firing ship.

In the present invention however the basis for the solution is on the consideration of the trigonometric relation of the factors analyzed from a reference point on coordinates parallel to and at right angles to the course of the torpedo after it has settled down on its course to the target.

It will be apparent on a consideration of the drawings of thereference application and the present application that with the use of the present basis of analysis the number of mechanisms required for the mechanical solution of the problem are reduced with attending decrease in cost and increase in accuracy.

Referring to Fig. 1, the firing ship, whose periscope is o, is on a course om, Co degrees from ON or North. The target at T is on a course Tn, Ct degrees from TN or North.

The dotted line I, I is the locus of reference points, r, at which a fictitious torpedo running at a constant speed equal to that of the final speed of the actual torpedo, andstarting at the instant of the firing of theactual torpedo will merge with the path of the actual torpedo at the point i, when it settles down on a steady course to the target. The position of the reference point 1" relative to the periscope o of the firing ship is a function of the gyro angle Bf and may be expressed as coordinates a and b parallel and at right angles respectively to the course of the fictitious torpedo. In practice, the values 'of the coordinates a and b are found by experimentally .determining the turning radius and the time of turning to the point of the actual torpedo for the various gyro angles. The reference point r for any selected gyro angle B is obtained by extending backward the line representing the straight portion of the actual torpedos course a distance 7'1", which represents the distance the fictitious torpedo, traveling at the normal speed of the actual torpedo, will move during the time required by the actual torpedo to reach the point 7' after being fired. Sufficient positions of the point r for different values of gyro angle are thus obtained to determine the form of the line I, I from which the coordinates a and b may be obtained for any gyro angle Bf. Cams are then constructed to give the values of the coordinates for any gyro angle. 1

In referring to Fig. 1 it is seen that the known or estimated values or conditions ofthe problem are obtained as follows. The relative target bearing Br is obtained from the periscope or other instrument. The present or observed range R is obtained from a range finder or other range indicating means. The speed St and course C7? or target angle A of the target may be estimated from observation or may be determined by generating the values of target bearing and range, using the estimated target speed and course as part of the setting for generating the values. The target speed and course may then be adjusted until the generated values of range and bearing remain equal to the observed values which condition indicates that the settings of target speed and course are correct. The speed of the torpedo Sf and the speed So and course Co of the firing ship are also known.

The values directly attainable from the known or estimated values just referred to are the true bearing B which is equal to course of own ship Co combined with relative bearing Br,

B=BT+CO 1) The value of target angle A is equal to the true bearing B minus 180 minus the target course A=B-Ct-180 (2) By substituting Equation 1 in Equation 2,

A=Br+CoCt-180 (3) The primary unknown values are the gyro angle Bi and the time of run of the torpedo tf. With these values known all the other unknown values may be determined, for example the run of the fictitious torpedo Rf equal the torpedo speed Sf multipled by the time of run if.

In solving the problem in accordance with the principles of this invention the range R and the distance traveled by the target during the run of the torpedo tf-St are converted into components parallel and perpendicular to the course of the fictitious torpedo which as has been eX- .plained is parallel to the straight portion of the path of the real torpedo. These components are therefore parallelto the coordinates a. and b.

The components OP and TP of the observed range R are proportional to the cosine and sine functions of the angle Bf-Br and are expressed by the equations,

OP=R cos (Bf-Br) (7) TP=R sin (Bf-Br) (8) The components of the distance traveled by the target during the run of the torpedo are proportional to the cosine and sine functions of the angle of impact A and are expressed mathematically as (tf-S-t) cos Af (9) (ti-St) sin A (10-) From these components and the coordinates a and b the primary unknowns, gyro angle Bf and time of run if, may be obtained by simultaneous solution of the following equations:

Rf=tf-Sf=a+R cos (Bf-Br)- (tf-St) cos Af (11) b=R sin (BfBr) (t,f-St) sin A (12) Equations 11 and 12 are solved by a series of approximation for the primary and secondary unknowns, for example, Rf may initially be taken as equal to R, Bf as equal to Br, and A as equal to A. From the use of these approximations successive values of the unknowns are obtained with increasing accuracy by the method of successive approximations. Mathematically this i a long and tedious method of solving the problem but by the use of the mechanism of this invention in which the successiively obtained values of the unknowns immediately affect the related values the final solution is obtained practically immediately and a new solution is immediately obtained whenever new controlling values may be set into the mechanism.

The course of the firing ship 00 is set up in the mechanism by crank l rotating shaft 2, or it may be automatically introduced by servo-motor 3 controlled by repeater motor 4 in the conventional manner. The speed of the firing ship So is set up in the mechanism by crank 5 rotating shaft 6 or this value may be set up automatically in the mechanism by servo-motor 1 controlled by repeater motor 8, in the conventional manner. the mechanism by crank 9 rotating shaft l0 and the speed of the target is set up in the mechanism by crank l l rotating shaft l2. The true bearing of the target (B) is set up in the mechanism by crank I3 rotating shaft 14. The range is set up in the mechanism by crank l5 rotating shaft 16.

As these factors may be observed intermittently, it i desirable that they be continuously generated. To this end, the bearing setting shaft I4 is connected to differential IT. A second side of this differential is connected by shaft 18 to differential I9 where the rotation of shaft l8, which represents the true bearing B, is combined with the course of the target Ct, represented by rotation of shaft III, to obtain the target angle A, represented by the rotation of shaft 20. The target angle A and the speed of the target St are fed into target component solver 2 I. Likewise the true bearing of the target B, represented by the rotation of shaft I8, is combined with the course of the firing ship Co, represented by the rotation of shaft 2, in differential 22 from which is obtained, as the third side of the difierential, the angle Br or the relative bearing of the target, represented by the rotation of shaft 23. The relative bearing of the target Br and the speed of the firing ship So are fed into ships component solver 24. The component of movement XSt of the target across the line of bearing Br is represented by the rotation of shaft 25 connected to one output slide of the target component solver 2| and the component of movement XSo of the own ship across the line of bearing Br is represented by the rotation of shaft 26 connected to one output slide of the ship component solver 24. The values of the components X81? and X are expressed mathematically by the equations,

XSt=St sin A (13) XS0=S0 sin Br (14) The rotation of shafts 25 and 26 are combined in differential 21, the output of which shaft 28, represents the rate of change of the true bearing dB multiplied by the range R or R013. The value RdB, which is the relative lateral rate of movement of the own ship and target across the line of bearing Br, is obtained in accordance with the equation,

RdB=XSt+XSO (15) The course of the target is set up in,

Q Gl QBt mum Shaft 28 is connected to the control member 29 of an integrator whose driving plate 39 is rotated at a constant speed, representing time t, by motor 3|. The output of this integrator T I RdB represented by the rotation of shaft 32, is connected to the driving plate of an integrator 33 whose control element 33' is moved in proportion to l/R, as will be explained later. The output of integrator 33, represented by the rotation of shaft 34, is proportional to T f RdB T [as divided by R or Shaft 34 is connected to the third side of differ- YSt=St cos A (16) Y-S'o: -80 cos Br (17) The output of this differential, represented by the rotation of shaft 38, is in proportion to the rate of change of the range dR, which is expressed mathematically by the equation dR=YSt+YSO (18) Shaft 38 is connected to the control element 39 of integrator 40. The output of this integrator T I dB represented by the rotation of shaft 4|, is connected to shaft l6 by differential 42, the output of which, represented by the rotation of shaft 43, is in proportion to the range R. Shaft 43 is connected to a cam mechanism 44 whose output 33' is in proportion to l/R previously referred to.

The gyro angle and torpedo run are obtained from a closed or regenerative system comprising a range component solver 45, a, target component solver 46, a target speed multiplier 41, a torpedo speed multiplier 48, a time of run motor 49, a time of run motor control 50, an a, component cam 8, b component cam 52, a gyro angle motor 53, and a gyro angle motor control 54.

The inputs to the range component solver 45 are the angle Bf-Br and the range R. The angle Bf-B'r is obtained from a differential 55, the inputs of which are the shaft 23 representing the value 131' and a shaft 56 representing the gyro angle B The shaft 56 is driven by the gyro angle motor 53 under the control of the gyro angle motor control 54 or I09 as will be hereinafter described. The output Bf-Br of the differential 55 drives shaft 51 yvhich is con-- nected to the range component solver 45. The shaft 43 is connected as an input to the range component solver 45, thereby introducing the range (R). The output of range component solver 45 are R sin (BfBr) and R cos (B,f-Br) and are represented by the rotation of shafts 58 and 59 respectively. See Equations (8) and (7).

The inputs to the target component solver 46 are the angle of impact A and the distance traveled by the target during the time of run of the torpedo. Referring to Equation 6 it will be seen that Af=A+(BfBr). The value A) is introduced into the target component solver 46 by the shaft 60, which is connected to differential 6|, where the rotation of shaft 20, representing the target angle A, is combined with the rotation of shaft 51, representing the value BfBr. The second input to the component solver 46, distance traveled by the target during the time of run of the torpedo, is obtained by multiplying the target speed St by the time of run if in the target speed multiplier 41. Input slide 62 of the multiplier 41 is driven by shaft I2 whereby it is moved in accordance with target speed. Input slide 63 is driven in accordance with time of run of the torpedo tf by shaft 64 which is connected to the time of run motor 49. The output slide 65 of the multiplier is moved in the well known manner proportional to the product of the inputs, in this case target speed multiplied by time of run or tf-St. This movement is communicated to the target component solver 46 by shaft 66. The outputs of target component solver 46 are (ff-St) sin Af and (ff-St) cos A),

which are represented by the rotation of shafts 6'! and 68 respectively.

The torpedo speed multiplier 48 is similar in all mechanical respects to the target speed multiplier 41. One input is moved in accordance with torpedo speed as represented by rotation of shaft 69, which is rotated by handcrank 10. The value of torpedo speed introduced is indicated by dial H. The other input is moved in accordance with time of run of the torpedo as represented by the shaft 64. The output, represented by rotation of shaft 12, is the product of torpedo speed and time of run or Rf, the distance run by the torpedo. See Equation 4.

The a coordinate cam 5| and the b coordinate cam 52 are rotated in accordance with gyro angle Bf by the shaft 56. The movement of the output member 51' of the a component cam 5| is transmitted by shaft 13 to differential 14 where it is combined with the output of differential 15, which output represents the combined movement of the shafts 59 and 68. The movement of the output shaft 12' of differential 14 therefore represents a+R cos (BfBr) -(tf-St) cos A), which will be recognized as one side of Equation 11. The movement of shaft I2 represents US) or R which is the other side of Equation 11. The movements of shafts 12 and [2, representing the two sides of Equation 11, act through differential 16 to which they are both connected to actuate the time of run motor control 50 to control the time of run motor 49, in the usual manner, until the movement of the shaft 12, driven by the motor 49 through the torpedo speed multiplier 48 to equal one side of the Equation 11, equals the movement of the shaft 12', which represents the other side of Equation H as determined from the combined outputs of the a component cam 5|, the target speed component solver 46, and the range component solver 45.

The movement of the output member 52 of the b component cam 52 is connected by a shaft 11 to one member of differential 18, where it is compared to the output of differential I9 to which a second member of differential 18 is connected by 7 shaft H. The rotation of shaft 11' is the result of the combination in differential I9 of the rotation of shafts 58 and 61, which have been shown to represent R sin (Bf- Br) and. (ti-St) sin A) respectively. The gyro angle motor control 54 is connected to the third member of differential I8 and its movement therefore represents a comparison of the rotation of shafts 11 and I1, which represent the values b and R sin (BfBr)(tf-St) sin Af respectively. These values will be recognized as the two sides of Equation 12. The gyro angle motor 53 is controlled in the usual manner from control 54 to drive the b component cam 52 until the value b equals R sin (BfBr)(t,f-St) sin Af as compared in differential I8.

The simultaneous operation of the time of run motor 49 and the gyro angle motor 53 result in the continuous solution of Equations 11 and 12 to give the gyro angle Bf and time of run of the torpedo tf. From time of run, the distance run Rf is obtained through the torpedo speed multiplier 48. If the torpedo speed is fixed, the length of run of the torpedo Rf then bears a fixed relation to the time of run 1; When this condition exists the torpedo speed multiplier 48 may be omitted and shaft 54 connected directly to drive shaft I2 at the appropriate fixed ratio.

The angles of ships course and gyro angle are set up for visual observation in dial group 80. The true bearing of the target B is connected to the larger dial 8| by shaft I8. The relative bearing of the target Br is connected to plate 82 by shaft 23. These dials are read against a fixed index 80' to respectively indicate true and relative bearing of the target. A pointer 83 indicates gyro angle when read against the dial or plate 82 and receives its motion from shaft 51 which is connected to differential 55. The inputs into this differential are the relative bearing of the target Br, represented by the rotation of the shaft 23, and the gyro angle Bf, represented by the rotation of shaft 56. The ship's course is observed by referring the center line of the represented ship on dial 82 to the large dial 8|.

The dial group 84 indicates the angles at the target. The larger dial 85 is the true bearing of the target and is driven by shaft I8. The smaller dial 86 is target angle and is driven by shaft 20. The pointer 87', representing the angle of impact A when read against the target angle dial, is rotated by shaft 51. When the bow of the target is read against the large dial, the reading istarget course. The fixed pointer 88 read against the target dial gives the target angle A.

Dials indicating the instantaneous values of the various factors are inserted as may be desired, such as dial 89 indicating the speed of the target, dial 90 indicating the speed of the firing ship, dial 9| indicating the gyro angle. The instantaneous range is indicated by counter 92 and the run of the torpedo Rf is indicated by dial 93. A transmitter 94, driven by shaft 55, is provided for transmitting the value Bf.

Power for the various motors and their controls is obtained from electric leads 95 and 96. As the operation of such motors from their controls is well known in the prior art, no further ,description of their operation is believed to be required.

A compensating differential 91 is provided for each of the four component solvers 2I, 24, 45 and 46. The purpose of this differential is to cause the cam gears to rotate with the vector direction 8 gear so that change of direction of the vector will not cause movement relative to the cam gear and therefore change of length of the vector. Because of these differentials 91 a change of length of the vector is caused to be proportional only to the desired value.

It will be noted from the description of the invention hereinbefore disclosed that a false solution of the problem'may be given by the instrumentin certain critical cases where the computed range is'so short that the point of joining of the track of the fictitious torpedo and the track of the actual torpedo is beyond the range of the target, i, e., for the computed course of the torpedo the fictitious torpedo intercepts the target before the actual torpedo has reached its steady course portion of its track and joins the track of the fictitious torpedo. Such a condition is illustrated in Fig. "1c, in which like reference characters indicate like designations in Fig. 1. From an examination of Fig. 1a, it will be seen that a false solution occurs when for an obtained gyro angle the distance run Rf is less than the distance 17', from the reference point r to the point 7' where the tracks of the fictitious and the actual torpedo join, that is, the actual torpedo in following the curved path crosses in front of the target.

The geometrical aspects of the true solution of critical cases are shown in Fig. 1b in which it will be seen that the distance run R) is greater than the distance from the reference point r to the point :i. Since the distance from the reference point r to the point 1 is a function of the gyro angle, a cam mechanism may be constructed to furnish this value.

The instrument automatically gives a true solution of critical as well as normal cases, as

follows:

The rj cam is mounted on a gear 98 driven from shaft 56 in accordance with the gyro angle determined by the mechanism. The cam is so shaped that the movement of the output member 98' represents the distance from the reference point r to the point 7' and is designated as M.

As previously explained, if this value exceeds the run of the torpedo R) the solution is false. The values 17 and Rf are therefore compared by a differential 99 which is connected to the output member 98 by a shaft I00 and to shaft I2 by a shaft I 0|. The output of differential 99, represented by the rotation of shaft I02, drives a cut-out mechanism I03. This cut-out mechanism consists of a. gear I04 having a cam out in one side. This cam consists of two circumferential sections of slightly different radii and an interconnnecting section connecting the two. A follower arm I05 is positioned by this cam so that a contact I06 on the end of the arm is normally in contact with fixed contact I01 and power from lead is supplied to the gyro angle motor control 54. This normal position of thefollower arm I05 prevails when the torpedo run R) is greater than the value of T7 and the operation of the gyro angle motor 53 under its control 54 is as previously described.

If for any reason the determined torpedo run Rf becomes less than the value r9 due to the corresponding gyro angle Bf obtained by the mechanism, the follower arm I05 shifts to the smaller radius section of the cam and the contact I06 is moved away from contact I01 and brought into contact with the fixed contact I08 which is connected to the common contact of er s a control member I09 driven by the shaft ll. By this shift from normal gyro-angle control 54 to the control member 109, the effect of the b element of Equation 12 as represented by the position of member 52 is temporarily eliminated from the solution. The gyro angle motor 53 under this condition runs in a direction to reduce the yro angle to bring the course of the torpedo in line with the torpedo tube. This reduction in the gyro angle changes the angle inputs of the component solvers 45 and 46 and thereby repositions the associated members. The repositioning of the members representing components parallel to the course of the torpedo causes the control 50 to actuate the time of run motor 49 until the resulting torpedo run Rf is greater than the value 17' obtained from the cam output 98' when the control arm shifts back to contact I01 and normal operation of the mechanism under control 54 is resumed and the correct solution obtained, as indicated by Fig. 11).

It is apparent that the control member I09 and the arm of the motor control 54 must be yieldably connected to their respective shafts. This may be accomplished by controlling the contact arm through a cam, as shown in Fig. 19 of Patent 1,904,215.

It is evident that various changes or variations from the exact structure indicated in the drawings and specification may be made by those skilled in the art without departing from the scope of the invention as covered in the appended claims.

I claim:

1. In a torpedo director of the regenerative type for determining the distance run and the course of the torpedo to reach a point of intercept with a target, means settable in accordance with the range and relative bearing of the target from an observing point on a firing ship, an element positionable in accordance with the steady course of the torpedo relative to the firing ship, members acuated in accordance with the position of said element and moved in proportion to components of position relative to the observing point of a reference starting point of a fictitious torpedo starting at the instant of firing of the actual torpedo and traveling to the point of intercept at a constant speed equal to that of the actual torpedo and on a course the same as that of the actual torpedo after it has settled down on its steady course to the target, the position of said members representing components along coordinates parallel to and at right angles to the steady course of the torpedo, a part positionable in accordance with the time of run of the torpedo, multiplying means having inputs actuated in accordance with the position of the part and the speed of the target and an output whose position represents the distance run by the target to the point of intercept during the time of run of the torpedo, vector means adjustable in length by the range settable means and angularly positioned by the relative bearing settable means and the position of the element, component members associated with said vector means and positioned thereby in accordance with components of the range of the target along coordinates parallel and at right angles to the steady course of the torpedo, means settable in accordance with the target angle, second vector means adjustable in length by the output of the multiplier and angularly positioned by the relative bearing settable means and by the position of the element and by thetarget angle settable operator new means, component members associated with said second vector means and positioned thereby in accordance with components of the distance run run by the target to the point of intercept along coordinates parallel and at right angles to the steady course of the torpedo, means differentially combining the positions of the members representing the three said components along coordinates parallel to the steady course of the torpedo, means responsive to the combining means and moved from normal position for controlling the positioning of the part in accordance with the time of run of the torpedo, said combining means including a member actuated by the part in accordance with the distance run by the fictitious torpedo to the point of intercept to restore the responsive means to normal position, means differentially combining the positions of the members representing the three said components at right angles to the steady course of the torpedo, and means responsive to the last mentioned combining means for positioning the element in accordance with the steady course of the torpedo relative to the firing ship.

2. In a torpedo director of the regenerative type for determining the distance run and the course of the torpedo to reach a point of intercept with a target, means settable in accordance with the range and relative bearing of the target from an observing point on a firing ship, an element positionable in accordance with the steady course of the torpedo relative to the'firing ship, members actuated in accordance with the position of said element and moved in proportion to components of position relative to the observing point of a reference starting point of a fictitious torpedo starting at the instant of firing of the actual torpedo and traveling to the point of intercept at a constant speed equal to that of the actual torpedo and on a course the same as that of the actual torpedo after it has settled down on its steady course to the target, the position of said members representing components along coordinates parallel to and at right angles to the steady course of the torpedo, a part positionable in accordance with the time of run of the torpedo, multiplying means having inputs actuated in accordance with the position of the part and the speed of the target and an output whose position represents the distance run by the target to the point of intercept during the time of run of the torpedo, vector means adjustable in length by the range settable means and angularly positioned by the relative bearing settable means and the position of the element, component members associated With said vector means and positioned thereby in accordance with components of the range of the target along coordinates parallel and at right angles to the steady course of the torpedo, means settable in accordance with the target angle, second vector means adjustable in length by the output of the multiplier and angularly positioned by the relative bearing settable means and by the position of the element and by the target angle settable means, component members associated with said secondvector means and positioned thereby in accordance with components of the distance run by the target to the point of intercept along coordinates parallel and at right angles to the steady course of the torpedo, second multiplying means having inputs actuated in accordance with the position of the part and the speed of the torpedo and an output whose position represents the distance run by the. fictitioustorpedo to the point of intercept, means differentially equating the positions of the members representing the three said components along coordinates parallel to the steady course of the torpedo against the position of the output of the second multiplying means, follow-up means responsive to the equating means for positioning the part in accordance with the time of run of the torpedo, means differentially combining the positions of the members representing the three said components at right angles to the steady course of the torpedo, and means responsiveto the combining means for positioning the element in accordance with the steady course of the torpedo relative to the firing ship.

3. In a torpedo director of the regenerative type for determining the distance run and the course of a torpedo to reach a point of intercept with a target, means settable in accordance with the range and relative bearing of the target from an observing point on a firing ship, an element positionable in accordance with the steady course of the torpedo relative to the firing ship, members actuated in accordance with the position of said element and moved in proportion to components of position relative to the observing point of a reference starting point of a fictitious torpedo starting at the instant of firing of the actual torpedo and traveling to the point of intercept at a constant speed equal to that of the actual torpedo and on a course the same as that of the actual torpedo after it has settled down on its steady course to the target, the position of said members representing components along coordinates parallel to and at right angles to the steady course of the torpedo, a part positionable in accordance with the time of run of the torpedo, multiplying means having inputs actuated in accordance with the position of the part and the speed of the target and an output whose position represents the distance run by the target to the point of intercept during the time of run of the torpedo, vector means adjustable in length by the range settable means and angularly positioned by the relative hearing settable means and the position of the element, component members associated with said vector means and positioned thereby in accordance with components of the range of the target along coordinates parallel and at right angles to the steady course of the torpedo, means settable in accordance with the target angle, second vector means adjustable in length by the output of the multiplier and angularly positioned by the relative bearing settable means and by the position of the element and by the target angle settable means, component members associated with said second vector means and positioned thereby in accordance with components of the distance run by the target to the point of intercept along coordinates parallel and at right angles to the steady course of the torpedo, means differentially combining the positions of the members representing the three said components along coordinates parallel to the steady course of the torpedo, means responsive to the combining means and moved from normal position for controlling the positioning of the part in accordance with the time of run of the torpedo, said combining means including a member actuated by the part in accordance with the distance run by the fictitious torpedo to the point of intercept to restore the responsive means to normal position, means differentially combining the positions of the members representing the three said components at right angles to the steady course of the torpedo, means responsive to the last mentioned combining means for positioning the element in accordance with the steady course of the torpedo relative to the firing ship, means positioned by the member actuated in accordance with the distance run by the fictitious torpedo to the point of intercept, means positioned by the element in proportion to the distance run by the fictitious torpedo to the point where the actual torpedo has settled down on its steady course to the target, means differentially comparing the positions of the last two mentioned means, and means operatively responsive to the comparing means for reducing the effective value of the component of position of the reference point measured at right angles to the course of the torpedo when the distance represented by the means positioned by the member is less than the distance represented by the means positioned by the element.

4. In a torpedo director of the regenerative type for determining the distance run and the course of a torpedo to reach a point of intercept with a target, means settable in accordance with the range and relative bearing of the target from an observing point on a firing ship, an element positionable in accordance with the steady course of the torpedo relative to the firing ship, members actuated in accordance with the position of said element and moved in proportion to compo? nents of position relative to the observing point of a reference starting point of a fictitious torpedo starting at the instant of firing of the actual torpedo and traveling to the point of intercept at a constant speed equal to that of the actual torpedo and on a course the same as that of the actual torpedo after it has settled down on its steady course to the target, the position of said members representing components along coordinates parallel to and at right angles to the steady course of the torpedo, a part positionable in accordance with the time of run of the torpedo, multiplying means having inputs actuated in accordance with the position of the part and the speed of the target and an output whose position represents the distance run by the target to the point of intercept during the time of run of the torpedo, vector means adjustable in length by the range settable means and angularly positioned by the relative bearing settable means and the position of the element, component members associated with said vector means and positioned thereby in accordance with components of the range of the target along coordinates parallel and at right angles to the steady course of the torpedo, means settable in accordance with the target angle, second vector means adjustable in length by the output of the multiplier and angularly positioned by the relative bearing settable means and by the position of the element and by the target angle settable means, component members associated with said second vector means and positioned thereby in accordance with components of the distance run by the target to the point of intercept along coordinates parallel and at right angles to the steady course of the torpedo, second multiplying means having inputs actuated in accordance with the position of the part and the speed of the torpedo and an output whose position represents the distance run by the fictitious torpedo to the point of intercept, means differentially equating the positions of the members representing the three said components along coordinates parallel to the steady course of the torpedo against the position of the BU] to i LAM).

g tent that 13 output of the second multiplying means, followup means responsive to the equating means for positioning the part in accordance with the time of run of the torpedo, means difierentially com- 14 distance run by the fictitious torpedo to the point where the actual torpedo has settled down on its steady course to the target, means differentially comparing the positions of the last two binirg the positions of the members represent- 5 mentioned means, and means operatlvely reing the three said components at right angles to sponsive to the comparing means for reducing the steady course of the torpedo, means responthe effective value of the component of position sive to the combining means for positioning the of the reference point measured at right angles element in accordance with the steady course of to the course of the torpedo when the distance the torpedo relative to the firing ship, means po- 10 represented by the means positioned by the outsitioned by the output of the second multiplier in accordance with the distance run by the fictitious torpedo to the point of intercept, means positioned by the element in proportion to the put of the second multiplier is less than the distance represented by the means positioned by the element.

WILLIAM H. NEWELL. 

